A juror in the George Zimmerman trial has said the actions of both the former Florida neighbourhood watch volunteer and Trayvon Martin led to the teenager's fatal shooting.

The woman known as Juror B37 told CNN Mr Zimmerman made some poor decisions leading up to the shooting, but he had not broken the law.

She added that Trayvon was not innocent either.

"I think both were responsible for the situation they had gotten themselves into," said the juror, one of six women who made up the panel. "I think they both could have walked away."

The juror said Sanford Police Detective Chris Serino made a big impression on her, because he would have been accustomed to dealing with murders and similar cases.

Image Caption:Rachel Jeantel testifies

He would have known how to spot a liar, and yet he testified that he believed Mr Zimmerman, the juror said.

Legal analysts agreed that Detective Serino's testimony was a blow to the state's case.

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But the juror was not impressed by the testimony of Trayvon's friend Rachel Jeantel, who was talking with him on his mobile phone moments before he was fatally shot by Mr Zimmerman in February, 2012.

"I didn't think it was very credible, but I felt very sorry for her," the juror said. "She didn't want to be there."

While prosecutors accused Mr Zimmerman of racially profiling Trayvon Martin, he maintained he acted in self-defence.

The juror said she did not think Trayvon's race was the reason Mr Zimmerman followed him. She said she also believed Trayvon threw the first punch and Mr Zimmerman, whom she referred to as "George", had a right to defend himself.

"I have no doubt George feared for his life in the situation he was in at the time," the juror said.

Juror B37 also outlined the process the jury went through in their deliberations.

Based on an initial vote, three - including B37 - were in favour of acquittal, two wanted manslaughter and one wanted second-degree murder. She said the jury started going through all the evidence, listening to tapes multiple times.

"That's why it took us so long," B37 said.

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When they started looking at the law, the person who initially wanted second-degree murder changed her vote to manslaughter.

Then they asked for clarification from the judge and kept going over it again and again. B37 said some jurors wanted to find Mr Zimmerman guilty of something, but there was just no place to go based on the law.

B37 said jurors cried when they gave their final vote to the bailiff.

"I want people to know that we put everything into everything to get this verdict," said the juror, who appeared to become emotional during the interview.

"We thought about it for hours and cried over it afterwards," she said. "I don't think any of us could ever do anything like that ever again."

The juror had earlier announced she was planning to write a book about her experience, which attracted some sharp criticism from supporters of the dead teenager's family.

But in a statement released late on Monday via Martin Literary Management, she said that was no longer her intention.

"Now that I am returned to my family and to society in general, I have realised that the best direction for me to go is away from writing any sort of book and return instead to my life as it was before I was called to sit on this jury,” the statement read.

Anger over Mr Zimmerman's acquittal continued into Monday night, with protesters running through Crenshaw in Los Angeles, breaking windows, attacking people and raiding a store, while others blocked a major freeway in the San Francisco Bay Area.

Thirteen people were arrested on the third night of sporadic violence following Saturday's verdict.

"This will not be allowed to continue," LA Police Chief Charlie Beck warned.

However civil rights leaders said peaceful protests would continue this weekend with vigils in dozens of cities in front of federal buildings.

Meanwhile, the Justice Department is determining whether federal prosecutors can file criminal civil rights charges against Mr Zimmerman, who is now a free man.

But for that, they will need to find evidence that he was motivated by racial animosity.

Despite the racially charged nature of the case, race was barely mentioned at the trial.